This study could not have been completed without the help of a great many people who contributed to the final result in a variety of different ways and to whom I want to express my profound gratitude. As I worked on this project I could always count on the help of Bart Jansen and thereafter of Marly van Osch, both research colleagues at the Educational Technology Expertise Centre at the Open universiteit. Thank you both very much for your assistance and I wish you every succes in all your new endeavours.
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